Probing oxide-ion conduction in low-temperature SOFCs

Optical Interpretation of a Second-Order Phase Transition Induced by Thermal-Driven Li+ Migration via Configurational Entropy in CaTiO3:Li+,Yb3+,Er3+

“…The 660 nm peak, on the other hand, decreases slowly throughout the measurement. Since the absolute emission intensities of lanthanide ions are greatly affected by many factors such as pump power density, grain size, light-focused domain size, excitation light source fluctuations and spectrometers, and so forth, − the intensity ratio of the three emission peaks of Er 3+ ( I 525 , I 550 , and I 660 ) are used to evaluate the structural variation of the Ca 0.8 Li 0.1 Yb 0.05 Er 0.05 TiO 3 . Moreover, 2 H 11/2 and 4 S 3/2 are two thermally coupled energy levels (energy gap ∼ 800 cm –1 ), and the populations of these two energy levels satisfy Boltzmann’s law.…”

“…Li + -doped perovskite (ABO 3 )-type titanate has been reported as a good Li-ion conductor, , and it is also an excellent host for optical materials. − Thus, CaTiO 3 :Li is chosen as a good platform to investigate the abovementioned influences. It is known that the luminescence of rare-earth ions is sensitive to the change in its surrounding chemical environment. − Moreover, it has been reported that the ignition point of thermal-activated ion migration can be revealed by the intensity ratios of Er 3+ emission peaks, which has been proved by a series of means. − In this research, we investigated the temperature-triggered Li + migration, the resulting second-order phase transition, and thermal property variation in CaTiO 3 :Li + ,Yb 3+ ,Er 3+ , which is not yet reported. This research focuses on optical interpretation of the Li + -migration-induced phase transition with the Er 3+ luminescence and the configurational entropy as a bridge.…”

All-inorganic perovskite nanocrystals: next-generation scintillation materials for high-resolution X-ray imaging

“…Having severe impacts on thermal conductivity and ionic conduction, [38][39][40] the anion Frenkel (a-Fr) defects serve as the dominant imperfection type in fluorides and oxides lattice, formed by an anion moving from its original site to a neighboring interstitial site, resulting in an uncharged vacancy-interstitial defect pair in the lattice. 38,39,41,42 The migrating charge carriers can be trapped and stored in these defect states, mainly in those of vacancies. The electrons/holes in traps will be released by ambient thermal disturbance, followed by phonon-assisted migration.…”

Synthesis and Electrochemical Characterization of La0.6Sr0.4Co0.2Fe0.8O3–δ and BaZr0.8Y0.2O3–δ Electrospun Nanofiber Cathodes for Solid Oxide Fuel Cells

“…Therefore, reducing the operating temperature has become an important research topics of SOFCs. [24][25][26][27] It is essential to lower the running temperature while maintaining the low polarization resistance of the electrodes, and nanoelectrode materials can effectively solve these problems. [28,29] The technology of preparing SOFCs nanomaterials includes electrospinning, atomic layer deposition (ALD), pulse layer deposition (PLD), and other approaches.…”